公开(公告)号：WO1998011532A1

公开(公告)日：1998-03-19

申请号：PCT/US1997016140

申请日：1997-09-10

Applicant: CIRRUS LOGIC, INC.

Inventor： CIRRUS LOGIC, INC. ,  JENKINS, Michael

IPC: G10H07/02

CPC classification number: G10H1/125 ,  G10H7/02 ,  G10H2210/205 ,  G10H2210/281 ,  G10H2210/305 ,  G10H2240/056 ,  G10H2240/145 ,  G10H2250/061 ,  G10H2250/105 ,  G10H2250/121

Abstract: A variable sample rate approximation technique is used for coding and recreating musical signals in a wavetable synthesizer. Many sounds inherently include one large fast transfer of energy followed by vibrations that dampen over time so that the bandwidth requirement of a musical sound is reduced with passing time. Using the variable sample rate approximation technique, musical sounds are classified into two categories, sustaining sounds and percussive sounds. A sustaining instrument creates a noisy stimulus then sustains the sound created by the noisy stimulus. A percussive instrument is also a noisy source and generates a sound signal having high frequencies that decay rapidly while sustaining instruments sustain at all frequencies nearly equally. The sustaining and percussive instruments have substantially different waveform characteristics but present similar conditions with respect to memory reduction. Similarities between the acoustical characteristics of sustaining sounds and percussive sounds are exploited using a variable sampling rate technique to substantially reduce the memory budget of a wavetable synthesizer.

Abstract translation: 可变采样率近似技术用于在波形合成器中编码和再现音乐信号。 许多声音固有地包括一个大的快速的能量传递，随后随着时间的推移而衰减的振动，使得音乐声音的带宽需求随着时间的流逝而减少。 使用可变采样率近似技术，音乐声音分为两类，维持声音和打击乐。 持续的工具产生嘈杂的刺激，然后维持由嘈杂的刺激产生的声音。 打击乐器也是噪音源，并产生具有高频衰减的声音信号，同时维持仪器在所有频率下几乎保持平等。 持续和打击乐器具有基本上不同的波形特性，但在存储器减少方面存在相似的条件。 使用可变采样率技术来利用持续声音和打击乐声音的声学特性之间的相似性，以显着降低波形合成器的存储器预算。

公开(公告)号：EP0925576B1

公开(公告)日：2001-07-11

申请号：EP97941039.6

申请日：1997-09-10

Applicant: Cirrus Logic, Inc.

Inventor： JENKINS, Michael

IPC: G10H7/02 ,  G10H1/12

CPC classification number: G10H1/125 ,  G10H7/02 ,  G10H2210/205 ,  G10H2210/281 ,  G10H2210/305 ,  G10H2240/056 ,  G10H2240/145 ,  G10H2250/061 ,  G10H2250/105 ,  G10H2250/121

公开(公告)号：EP0925576A1

公开(公告)日：1999-06-30

申请号：EP97941039.0

申请日：1997-09-10

Applicant: Cirrus Logic, Inc.

Inventor： JENKINS, Michael

IPC: G10H1 ,  G10H7

CPC classification number: G10H1/125 ,  G10H7/02 ,  G10H2210/205 ,  G10H2210/281 ,  G10H2210/305 ,  G10H2240/056 ,  G10H2240/145 ,  G10H2250/061 ,  G10H2250/105 ,  G10H2250/121

Abstract: A variable sample rate approximation technique is used for coding and recreating musical signals in a wavetable synthesizer. Many sounds inherently include one large fast transfer of energy followed by vibrations that dampen over time so that the bandwidth requirement of a musical sound is reduced with passing time. Using the variable sample rate approximation technique, musical sounds are classified into two categories, sustaining sounds and percussive sounds. A sustaining instrument creates a noisy stimulus then sustains the sound created by the noisy stimulus. A percussive instrument is also a noisy source and generates a sound signal having high frequencies that decay rapidly while sustaining instruments sustain at all frequencies nearly equally. The sustaining and percussive instruments have substantially different waveform characteristics but present similar conditions with respect to memory reduction. Similarities between the acoustical characteristics of sustaining sounds and percussive sounds are exploited using a variable sampling rate technique to substantially reduce the memory budget of a wavetable synthesizer.